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Financial instruments (Details 9) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Financial instruments [Line Items]
Currency		US$
Series H bonds [Member]
Financial instruments [Line Items]
Contract amount	$ 148,159
Currency	UF
Derivative contracts, Maturity	Jan. 04, 2023
Series O bonds [Member]
Financial instruments [Line Items]
Contract amount	$ 58,748
Currency	UF
Derivative contracts, Maturity	Feb. 01, 2022
Series P Bonds [Member]
Financial instruments [Line Items]
Contract amount	$ 134,228
Currency	UF
Derivative contracts, Maturity	Jan. 15, 2028

X

- Definition

The amount of contractual undiscounted cash flows in relation to contractual amounts to be exchanged in a derivative financial instrument for which gross cash flows are exchanged. [Refer: Derivatives [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
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-IssueDate 2019-01-01
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X

- Definition

The description of the currency of the primary economic environment in which the entity operates.

+ References

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-IssueDate 2019-01-01
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X

- Definition

The maturity date of derivative contracts.

+ References

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- References

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